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2. Lub tsev waterproofing: asphalt tuaj yeem siv ua cov khoom siv dej lim dej, siv rau ru tsev, phab ntsa, thiab lwm cov chaw kom muab cov nyhuv waterproofing.
3. Anti - Cov khoom siv corrosion: asphalt tuaj yeem siv los ua anti- corrosion cov khoom thaum thov rau cov khoom siv hlau.
4. Cov khoom siv zoo nkauj heev: asphalt tuaj yeem siv los ua cov khoom siv dai, thov rau tsim phab ntsa rau cov nyhuv zoo nkauj.
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